/**
 * Read bits from a number into a string 
 * The string is limited to 0 and 1
 * 
 * @author gtowell
 * Created: April 2021
 * **/

#include <stdio.h>
#include<stdlib.h>

/**
 * readbits from a char using bit shifting, starting with the 
 * most significant bit.
 * 
 * @param xx -- the integer to be read
 * @param rtn -- a stirng into which to write the bits
 * **/
void pbBITSUP(int xx, char rtn[]) {
    unsigned int val = 1 << ((8 * sizeof(int)) - 1);
    for (int i = 0; i < 8 * sizeof(int); i++)
    {
        rtn[i] = '0' + ((xx&val)?1:0);
        //printf("bit num=%1d  value=%1d\n", i, xx % 2);
        xx <<= 1;
    }
}

int main(int argc, char const *argv[])
{
    char aa[8*sizeof(int)+1];
    aa[8 * sizeof(int) + 1] = '\0';
    aa[8 * sizeof(int)] = '\0';
        for (int i = 1; i < argc; i++)
    {
        pbBITSUP(atoi(argv[i]), aa);
        printf("BITS:%s\n", aa);
    }
    return 0;
}